#pragma once

#include <sys/types.h>

/* How many bytes from the start of the file we search for the header.  */
#define MULTIBOOT_SEARCH                        8192
#define MULTIBOOT_HEADER_ALIGN                  4

/* The magic field should contain this.  */
#define MULTIBOOT_HEADER_MAGIC                  0x1BADB002

/* This should be in %eax.  */
#define MULTIBOOT_BOOTLOADER_MAGIC              0x2BADB002

/* Alignment of multiboot modules.  */
#define MULTIBOOT_MOD_ALIGN                     0x00001000

/* Alignment of the multiboot info structure.  */
#define MULTIBOOT_INFO_ALIGN                    0x00000004

/* Flags set in the 'flags' member of the multiboot header.  */

/* Align all boot modules on i386 page (4KB) boundaries.  */
#define MULTIBOOT_PAGE_ALIGN                    0x00000001

/* Must pass memory information to OS.  */
#define MULTIBOOT_MEMORY_INFO                   0x00000002

/* Must pass video information to OS.  */
#define MULTIBOOT_VIDEO_MODE                    0x00000004

/* This flag indicates the use of the address fields in the header.  */
#define MULTIBOOT_AOUT_KLUDGE                   0x00010000

/* Flags to be set in the 'flags' member of the multiboot info structure.  */

/* is there basic lower/upper memory information? */
#define MULTIBOOT_INFO_MEMORY                   0x00000001
/* is there a boot device set? */
#define MULTIBOOT_INFO_BOOTDEV                  0x00000002
/* is the command-line defined? */
#define MULTIBOOT_INFO_CMDLINE                  0x00000004
/* are there modules to do something with? */
#define MULTIBOOT_INFO_MODS                     0x00000008

/* These next two are mutually exclusive */

/* is there a symbol table loaded? */
#define MULTIBOOT_INFO_AOUT_SYMS                0x00000010
/* is there an ELF section header table? */
#define MULTIBOOT_INFO_ELF_SHDR                 0x00000020

/* is there a full memory map? */
#define MULTIBOOT_INFO_MEM_MAP                  0x00000040

/* Is there drive info?  */
#define MULTIBOOT_INFO_DRIVE_INFO               0x00000080

/* Is there a config table?  */
#define MULTIBOOT_INFO_CONFIG_TABLE             0x00000100

/* Is there a boot loader name?  */
#define MULTIBOOT_INFO_BOOT_LOADER_NAME         0x00000200

/* Is there a APM table?  */
#define MULTIBOOT_INFO_APM_TABLE                0x00000400

/* Is there video information?  */
#define MULTIBOOT_INFO_VBE_INFO                 0x00000800
#define MULTIBOOT_INFO_FRAMEBUFFER_INFO         0x00001000

#ifndef __ASSEMBLER__

struct multiboot_header {
        /* Must be MULTIBOOT_MAGIC - see above.  */
        uint32_t magic;

        /* Feature flags.  */
        uint32_t flags;

        /* The above fields plus this one must equal 0 mod 2^32. */
        uint32_t checksum;

        /* These are only valid if MULTIBOOT_AOUT_KLUDGE is set.  */
        uint32_t header_addr;
        uint32_t load_addr;
        uint32_t load_end_addr;
        uint32_t bss_end_addr;
        uint32_t entry_addr;

        /* These are only valid if MULTIBOOT_VIDEO_MODE is set.  */
        uint32_t mode_type;
        uint32_t width;
        uint32_t height;
        uint32_t depth;
};

/* The symbol table for a.out.  */
struct multiboot_aout_symbol_table {
        uint32_t tabsize;
        uint32_t strsize;
        uint32_t addr;
        uint32_t reserved;
};
typedef struct multiboot_aout_symbol_table multiboot_aout_symbol_table_t;

/* The section header table for ELF.  */
struct multiboot_elf_section_header_table {
        uint32_t num;
        uint32_t size;
        uint32_t addr;
        uint32_t shndx;
};
typedef struct multiboot_elf_section_header_table multiboot_elf_section_header_table_t;

struct multiboot_info {
        /* Multiboot info version number */
        uint32_t flags;

        /* Available memory from BIOS */
        uint32_t mem_lower;
        uint32_t mem_upper;

        /* "root" partition */
        uint32_t boot_device;

        /* Kernel command line */
        uint32_t cmdline;

        /* Boot-Module list */
        uint32_t mods_count;
        uint32_t mods_addr;

        union {
                multiboot_aout_symbol_table_t aout_sym;
                multiboot_elf_section_header_table_t elf_sec;
        } u;

        /* Memory Mapping buffer */
        uint32_t mmap_length;
        uint32_t mmap_addr;

        /* Drive Info buffer */
        uint32_t drives_length;
        uint32_t drives_addr;

        /* ROM configuration table */
        uint32_t config_table;

        /* Boot Loader Name */
        uint32_t boot_loader_name;

        /* APM table */
        uint32_t apm_table;

        /* Video */
        uint32_t vbe_control_info;
        uint32_t vbe_mode_info;
        uint16_t vbe_mode;
        uint16_t vbe_interface_seg;
        uint16_t vbe_interface_off;
        uint16_t vbe_interface_len;

        uint64_t framebuffer_addr;
        uint32_t framebuffer_pitch;
        uint32_t framebuffer_width;
        uint32_t framebuffer_height;
        uint8_t framebuffer_bpp;
#define MULTIBOOT_FRAMEBUFFER_TYPE_INDEXED 0
#define MULTIBOOT_FRAMEBUFFER_TYPE_RGB     1
#define MULTIBOOT_FRAMEBUFFER_TYPE_EGA_TEXT     2
        uint8_t framebuffer_type;
        union {
                struct {
                        uint32_t framebuffer_palette_addr;
                        uint16_t framebuffer_palette_num_colors;
                };
                struct {
                        uint8_t framebuffer_red_field_position;
                        uint8_t framebuffer_red_mask_size;
                        uint8_t framebuffer_green_field_position;
                        uint8_t framebuffer_green_mask_size;
                        uint8_t framebuffer_blue_field_position;
                        uint8_t framebuffer_blue_mask_size;
                };
        };
};
typedef struct multiboot_info multiboot_info_t;

struct multiboot_color {
        uint8_t red;
        uint8_t green;
        uint8_t blue;
};

struct multiboot_mmap_entry {
        uint32_t size;
        uint64_t addr;
        uint64_t len;
#define MULTIBOOT_MEMORY_AVAILABLE              1
#define MULTIBOOT_MEMORY_RESERVED               2
#define MULTIBOOT_MEMORY_ACPI_RECLAIMABLE       3
#define MULTIBOOT_MEMORY_NVS                    4
#define MULTIBOOT_MEMORY_BADRAM                 5
        uint32_t type;
} __packed;
typedef struct multiboot_mmap_entry multiboot_memory_map_t;

struct multiboot_mod_list {
        /* the memory used goes from bytes 'mod_start' to 'mod_end-1' inclusive */
        uint32_t mod_start;
        uint32_t mod_end;

        /* Module command line */
        uint32_t cmdline;

        /* padding to take it to 16 bytes (must be zero) */
        uint32_t pad;
};
typedef struct multiboot_mod_list multiboot_module_t;

/* APM BIOS info.  */
struct multiboot_apm_info {
        uint16_t version;
        uint16_t cseg;
        uint32_t offset;
        uint16_t cseg_16;
        uint16_t dseg;
        uint16_t flags;
        uint16_t cseg_len;
        uint16_t cseg_16_len;
        uint16_t dseg_len;
};

#endif /* !__ASSEMBLER__ */
